diff --git a/htdocs/commande/class/commande.class.php b/htdocs/commande/class/commande.class.php
index cc744f9eb56..0975bfbd7ef 100644
--- a/htdocs/commande/class/commande.class.php
+++ b/htdocs/commande/class/commande.class.php
@@ -3686,7 +3686,7 @@ class Commande extends CommonOrder
 				$label .= ' '.$this->getLibStatut(5);
 			}
 			$label .= '<br><b>'.$langs->trans('Ref').':</b> '.$this->ref;
-			$label .= '<br><b>'.$langs->trans('RefCustomer').':</b> '.($this->ref_customer ? $this->ref_customer : $this->ref_client);
+			$label .= '<br><b>'.$langs->trans('RefCustomer').':</b> '.(empty($this->ref_customer) ? (empty($this->ref_client) ? '' : $this-ref_client) : $this->ref_customer);
 			if (!empty($this->total_ht)) {
 				$label .= '<br><b>'.$langs->trans('AmountHT').':</b> '.price($this->total_ht, 0, $langs, 0, -1, -1, $conf->currency);
 			}
diff --git a/htdocs/projet/index.php b/htdocs/projet/index.php
index 25844a573dd..600a246cf94 100644
--- a/htdocs/projet/index.php
+++ b/htdocs/projet/index.php
@@ -43,7 +43,7 @@ $action = GETPOST('action', 'aZ09');
 $search_project_user = GETPOST('search_project_user', 'int');
 $mine = GETPOST('mode', 'aZ09') == 'mine' ? 1 : 0;
 if ($mine == 0 && $search_project_user === '') {
-	$search_project_user = $user->conf->MAIN_SEARCH_PROJECT_USER_PROJECTSINDEX;
+	$search_project_user = (empty($user->conf->MAIN_SEARCH_PROJECT_USER_PROJECTSINDEX) ? '' : $user->conf->MAIN_SEARCH_PROJECT_USER_PROJECTSINDEX);
 }
 if ($search_project_user == $user->id) {
 	$mine = 1;